Cited by 381Retinal Diseases and TreatmentsOcular Diseases and Behçet’s SyndromeRetinal Imaging and Analysis

Parainflammation, Chronic Inflammation and Age-Related Macular Degeneration

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Chen, Mei, Xu, Heping·2015·Journal of Leukocyte Biology

Abstract

Inflammation is an adaptive response of the immune system to noxious insults to maintain homeostasis and restore functionality. The retina is considered an immune-privileged tissue as a result of its unique anatomic and physiologic properties. During aging, the retina suffers from a low-grade chronic oxidative insult, which sustains for decades and increases in level with advancing age. As a result, the retinal innate-immune system, particularly microglia and the complement system, undergoes low levels of activation (parainflammation). In many cases, this parainflammatory response can maintain homeostasis in the healthy aging eye. However, in patients with age-related macular degeneration, this parainflammatory response becomes dysregulated and contributes to macular damage. Factors contributing to the dysregulation of age-related retinal parainflammation include genetic predisposition, environmental risk factors, and old age. Dysregulated parainflammation (chronic inflammation) in age-related macular degeneration damages the blood retina barrier, resulting in the breach of retinal-immune privilege, leading to the development of retinal lesions. This review discusses the basic principles of retinal innate-immune responses to endogenous chronic insults in normal aging and in age-related macular degeneration and explores the difference between beneficial parainflammation and the detrimental chronic inflammation in the context of age-related macular degeneration.

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  • Danger signals in the retina may result in mild activation of the innate immune system, termed para-inflammation.

    “While the immune tolerance mechanism tries to counterbalance inflammation, danger signals in the retina may still result in mild activation of the innate immune system, in a process recently termed para-inflammation [27][28][29].”

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Authors
Chen, M., & Xu, H.
Affiliations
Queen's University Belfast (GB)
Corresponding author
Xu, Heping
Venue
Journal of Leukocyte Biology
Published
2015-08-20
Volume
98
Issue
5
Pages
713-725
ISSN
  • 0741-5400 (ISSN-L)
  • 1938-3673
OpenAlex
W2209285888
Cited by
381
References
189
Citations by year
2026: 29 · 2025: 39 · 2024: 49 · 2023: 48 · 2022: 44 · 2021: 50 · 2020: 39 · 2019: 25 · 2018: 24 · 2017: 20 · 2016: 12 · 2015: 2
FWCI
3.58
Type
journal article
Language
en
Open access
Locations
  • Journal of Leukocyte Biology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Research Portal (Queen's University Belfast) (submittedVersion)
Funders
  • Fight for Sight (1361/1362, 1425/1426)
  • Dunhill Medical Trust (R188/0211)
  • National Eye Research Center (061)
Topics
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
  • Health Sciences › Medicine › Ophthalmology › Ocular Diseases and Behçet’s Syndrome
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Retinal Imaging and Analysis
Keywords
age-related macular degeneration, parainflammation, chronic inflammation, microglia, complement system, blood-retinal barrier, oxidative stress, genetic susceptibility, environmental risk factors
MeSH terms
Aging, Animals, Chronic Disease, Humans, Immunity, Innate, Inflammation, Macular Degeneration, Microglia, Genetic Predisposition to Disease

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